题目:
People had to deal with the lack of food, clothing, fuel and almost everything,________ the danger from enemy action.
A.as far as
B.as long as
C.as well as
D.as soon as
答案:
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答案:D题目分析:采用化学方法物质的除杂有2个原则:1、加入的物质或采取的方法只能除去杂质,2、在除杂过程中不能引入新的杂质,物理手段也可以,A、除去氧化钙中碳酸钙,加入水,氧化钙会与水反应生成氢氧化钙...